51 lines
1.1 KiB
TypeScript
51 lines
1.1 KiB
TypeScript
import {
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Connection,
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PublicKey,
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Commitment,
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PublicKeyInitData,
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} from "@solana/web3.js";
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import { deriveAddress, getAccountData } from "../../utils";
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export function deriveEmitterSequenceKey(
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emitter: PublicKeyInitData,
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wormholeProgramId: PublicKeyInitData
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): PublicKey {
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return deriveAddress(
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[Buffer.from("Sequence"), new PublicKey(emitter).toBytes()],
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wormholeProgramId
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);
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}
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export async function getSequenceTracker(
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connection: Connection,
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emitter: PublicKeyInitData,
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wormholeProgramId: PublicKeyInitData,
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commitment?: Commitment
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): Promise<SequenceTracker> {
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return connection
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.getAccountInfo(
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deriveEmitterSequenceKey(emitter, wormholeProgramId),
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commitment
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)
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.then((info) => SequenceTracker.deserialize(getAccountData(info)));
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}
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export class SequenceTracker {
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sequence: bigint;
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constructor(sequence: bigint) {
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this.sequence = sequence;
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}
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static deserialize(data: Buffer): SequenceTracker {
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if (data.length != 8) {
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throw new Error("data.length != 8");
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}
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return new SequenceTracker(data.readBigUInt64LE(0));
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}
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value(): bigint {
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return this.sequence;
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}
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}
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